I have a brick chimney lined with 8" liner that is approximately 25' total distance from thimble to cap. I am having problems with condensation pouring out of the thimble. It is definitely related to outdoor temperature & the temp of the stove. I have yet to find the exact point at which it occurs but I know that when the stove is less than full output it usually happens especially if it's colder outside. (<25 degrees) My question is if it would be a problem to drill 1" hole to the bottom of the liner and route that condensation to a dry well filled with gravel? I am a builder and have the tools for this kind of fix but I'm not sure if this is the best idea or someone might have a better fix. As you can see this is working wonders for the decorative stone I laid behind the stove. The house is only 3 years old and I had the liner cleaned 3 weeks ago. He said it looked great. By the way, the stove is a Vermont Defiant. Any advice is appreciated.